Daikin VRV III REYQ8PY1, Service Manual

Page: 310 / 452

Si37-701 Troubleshooting by Indication on the Remote Controller
Troubleshooting 299
Troubleshooting
(V2816)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is
the voltage
imbalance applied to the
inverter in excess of
14 V (Y1)?
∗
2
NO
Part or wiring defect
After turning the power supply
OFF, check and repair the
main circuit wiring or parts.
(1) Loose or disconnected
wiring between power
supply and inverter
(2) K2 contact disposition,
fusion or contact is poor.
(3) Loose or disconnected
noise filter
Using a device capable of
constant recording of power
supply voltage record
power supply voltage
between 3 phases (L1 ~ L2,
L2 ~ L3, L3~L1) for about
one continuous week.
Open phase
Normalize field cause.
Power supply voltage imbalance
Even if the power supply voltage is not
unbalanced when measuring it, there are
many cases where it gets unbalanced during
nighttime (around 6:00PM to 10:00PM).
No abnormalities are
observed in the power
supply, but the imbalance
in voltage recurs.
Explanation for users
Fix power supply voltage
imbalance.
Replace the inverter PC board.
YES
YES
NO
Imbalance
in supplied voltage is
in excess of 14 V
(Y1).
∗
1
Open phase?
<When voltage monitoring is possible:>
∗
1. Measure voltage at the X1M power supply
terminal block.
∗
2. Measure voltage at connector X10A (RED,
WHITE and BLACK wire pins) of the diode
module inside the inverter while the compressor
is running.
∗
In accordance with "notification of inspection results" accompanying spare parts.
Give the user a copy of "notification of inspection results"and leave
it up to him to improve the imbalance.
Be sure to explain to the user that
there is a "power supply imbalance"
for which DAIKIN is not responsible.
measure
YES
NO